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PRODID:-//Discrete Mathematics Group - ECPv6.15.20//NONSGML v1.0//EN
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X-WR-CALDESC:Events for Discrete Mathematics Group
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TZID:Asia/Seoul
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TZOFFSETFROM:+0900
TZOFFSETTO:+0900
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DTSTART:20200101T000000
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BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20210413T163000
DTEND;TZID=Asia/Seoul:20210413T173000
DTSTAMP:20260419T065448
CREATED:20210329T063026Z
LAST-MODIFIED:20240705T190013Z
UID:3866-1618331400-1618335000@dimag.ibs.re.kr
SUMMARY:William Overman\, Some Ordered Ramsey Numbers of Graphs on Four Vertices
DESCRIPTION:Ordered Ramsey numbers were introduced in 2014 by Conlon\, Fox\, Lee\, and Sudakov. Their results included upper bounds for general graphs and lower bounds showing separation from classical Ramsey numbers. We show the first nontrivial results for ordered Ramsey numbers of specific small graphs. In particular we prove upper bounds for orderings of graphs on four vertices\, and determine some numbers exactly using  SAT solvers for lower bounds. These results are in the spirit of exact calculations for classical Ramsey numbers and use only elementary combinatorial arguments. \nThis is joint work with Jeremy Alm\, Kayla Coffey\, and Carolyn Langhoff.
URL:https://dimag.ibs.re.kr/event/2021-04-13/
LOCATION:Room B232\, IBS (기초과학연구원)
CATEGORIES:Discrete Math Seminar
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